Project:
Spiral-Vortex Structures of Galaxies
Line-of-sight velocity fields of gas with high precision
and resolution are planned to be obtained for the sample
of galaxies with regular spiral structure to reveal
systematic deviation from circular rotation and to analyze
it on the base of hydrodynamical models, which are in
progress. Observations will be performed by
3D-spectroscopy method at 6-meter telescope of
Special Astrophysical Observatory RAS.
The special attention will be paid to the search and study
of new structure ---
large-scale vortices ---
related
to spiral arms. The structure was lately discovered
by our team in some galaxies.
Using the new method based
on the Fourier analysis of the
line-of-sight velocity field allows to determine such fundamental
properties as pattern speed of spiral arms and locations of
resonances.
Besides regions of local deviations from circular rotation
at scales from hundreds parsecs to a few kiloparsecs will
be recognized, and some efforts to explain them will be
undertaken.
Taking into account local and systematic deviations from
the circular rotation, one can restore the shape of
equilibrium rotation curve and construct a model of mass
distribution in galaxies.
The investigation proposed makes possible to advance in
understanding the nature of galactic structures and the
ways they form.
Questions and remarks send to
Oleg V. Khoruzhii.
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